Developing Cartridge Blade Support Structure
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Solution Overview
Problem
The existing electrophotographic image forming apparatuses face issues with inconsistent toner layer thickness due to warping or distortion of the layer-thickness regulating blade, leading to uneven image density in the axial direction.
Innovation Solution
A developing cartridge design that includes a casing with an attachment portion for the layer-thickness regulating member, a receiving portion to apply pressing force perpendicular to the axial direction, and a wall portion between these components, which stabilizes the regulating blade and ensures consistent toner layer thickness by distributing the pressing force effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the developing unit is pressed uniformly toward the photosensitive drum by deforming protrusions, then the developing unit is pressed uniformly in the axial direction, but the layer-thickness regulating blade may warp or distort in the axial direction
Solution Approach 1:
The patent introduces a blade support structure as an intermediary element between the pressing mechanism and the layer-thickness regulating blade. This support structure includes a support portion that extends from the casing in the axial direction, positioned to support the rear surface of the regulating blade. The support structure acts as a mediator that distributes pressing forces and prevents direct transmission of deformation to the blade, thereby maintaining blade flatness while enabling uniform pressing of the developing unit.
Solution Approach 2:
The blade support structure is formed as an integrated composite component with the casing, creating a rigid support system that resists deformation. The support structure combines the casing material with extended support portions to create a composite structure that provides both structural integrity and blade support functionality, preventing warping while maintaining uniform pressing capability.
2Force
If the layer-thickness regulating blade is attached to the casing, then the blade is fixed in position, but the blade may warp or distort when pressing forces are applied
Solution Approach 1:
The blade support structure serves as an intermediary support system between the casing and the layer-thickness regulating blade. The support portions extend from the casing to provide additional support points on the rear surface of the blade, distributing pressing forces across multiple locations. This intermediary support prevents concentration of forces that would cause warping or distortion, maintaining blade stability during pressing operations.
Solution Approach 2:
The blade support structure divides the support function into multiple segments along the axial direction of the developing roller. By providing distributed support portions at different locations on the rear surface of the regulating blade, the structure segments the force distribution, preventing any single point from bearing excessive load that would cause deformation or warping.
Data Source
AI summary
A developing cartridge includes a casing configured to store a developing agent, a developing agent carrying member disposed rotatably in the casing and configured to carry the developing agent, and a layer-thickness regulating member configured to regulate a thickness of a layer of the developing agent. The casing includes an attachment portion to which the layer-thickness regulating member is attached, a receiving portion configured to receive pressing force for pressing the developing agent carrying member toward an image carrying member in a direction perpendicular to an axial direction of the developing agent carrying member, and a wall portion disposed between the attachment portion and the receiving portion. The receiving portion is disposed to overlap with at least a portion of the attachment portion when viewed from a direction perpendicular to the axial direction of the developing agent carrying member.